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Dhony Hermanto,Nurul Ismillayli,Saprini Hamdiani,Siti Raudhatul Kamali,Rahadi Wirawan,Handa Muliasari,Rochmad Kris Sanjaya 대한환경공학회 2024 Environmental Engineering Research Vol.29 No.4
Accurate and real-time detection of pesticides is needed to ensure food safety and ecosystem protection. A biosensor was developed to determine organophosphate pesticides using acetylcholinesterase (AChE) and silver nanoparticle (AgNP) immobilized on the alginate-chitosan film matrix. The sensing principle is based on organophosphate pesticides (OP) inhibiting AChE activity. AChE hydrolyzes acetylthiocoline (ATCh) to thiocholine (TCh) and acetic acid (AA). The -SH group on TCh induces AgNP aggregation, resulting in fading of the films brownish-yellow color. The presence of OP in the sample inhibited AChE activity, leading to a decrease in TCh and color fading. The biosensor response is determined by measuring the Red Green Blue (RGB) value of the film. The biosensor offers rapid detection directly in-situ and real time without the use of sophisticated instruments, with optimal measurement conditions of pH 7, incubation time of 1 minute, and concentrations of AgNP, ATCh, and tris-HCl buffer of 10 μg/mL, 50, and 7 mM, respectively. Biosensors have excellent sensitivity, reproducibility, and selectivity. Measurement of OP levels in nine vegetable samples revealed that the proposed colorimetric probes results agreed well with the GC result as the reference method. Therefore, this method can be applied in monitoring food and environment OP levels.
Tribology Characteristics in 300 μm of Hexagonal Array Dimple Pattern
Choi, H. J.,Hermanto, A. S.,Kwon, S. H.,Kwon, S. G.,Park, J. M.,Kim, J. S.,Chung, S. W.,Chae, Y. H.,Choi, W. S. Korean Tribology Society 2015 한국트라이볼로지학회지 (Tribol. Lubr.) Vol.4 No.1
In the tribological performance of materials, a textured surface reduces the friction coefficient and wear. This study investigates the effects of a pattern of 300 µm dimples in a hexagonal array on the tribological characteristics. Previous studies investigated 200 µm dimples by using a similar material and method. There are three frictional conditions based on the Stribeck curve: boundary friction, mixed friction, and fluid friction. In this experiment, we investigated the frictional characteristics by conducting frictional tests at sliding speeds ranging from 9.6 rpm to 143.3 rpm and a normal load ranging from 13.6 N to 92 N. We used a photolithography method to create dimples for surface texturing. We used five specimens with different dimple densities 10%, 15%, 20%, 25%, and 30% in this study. The dimple density on the surface area is one of the important factors affecting the friction characteristics. The duty number graph indicates a fully developed fluid friction regime. Fluid friction occurs at a velocity of 28.7-143.3 rpm. We observed the best performance at a dimple density of 10% and a dimple diameter of 300 µm in the hexagonal array, the lowest friction coefficient at 0.0037 with 9.6 rpm 9.6N load, and the maximum friction coefficient at 0.0267 with 143.3 rpm 92N load.
Dhaha Praviandi KUANTAN,Hermanto SIREGAR,Anny RATNAWATI,Solikin M. JUHRO 한국유통과학회 2021 The Journal of Asian Finance, Economics and Busine Vol.8 No.12
This study was conducted to comprehensively identify factors that potentially influence corporate investment behavior, including micro, macro, and sectoral variables. Furthermore, investment behavior was studied across nations based on their participation in the global value chain (GVC), which was evaluated based on commodities, limited manufacturing, advanced manufacturing, and innovative activities. The study uses the dynamic panel data analysis and Generalized Method of Moment (GMM) estimation for a sample of 800 corporations, with data spanning over 2000−2019. The study result shows that in all types of countries, the coefficient lag indicator of capital expenditure statistically has a significant effect on capital expenditure. Sales growth, exchange rate, and GDP have a significant positive effect on corporate investment growth, while DER has a negative effect. In commodity countries, corporate investment is influenced by sales growth, exchange rate, and FCI. The variables that influence corporate investment in manufacturing countries are the FCI, exchange rate, sales growth, GDP, and DER. In innovative countries, variables that significantly affect capital expenditure are DER, GDP, and Tobin Q. In each type of country, the interaction terms between exchange rate and commodity price are positive and statistically significant.
Bolly, Hendrikus Masang Ban,Faried, Ahmad,Hermanto, Yulius,Lubis, Billy Parulian,Tjahjono, Firman Priguna,Hernowo, Bethy Suryawathy,Arifin, Muhammad Zafrullah The Korean Neurosurgical Society 2021 Journal of Korean neurosurgical society Vol.64 No.1
Objective : Diffuse astrocytic tumour (DAT) is a diffuse infiltrative astrocytoma tumour accompanied by molecular parameters such as the presence or absence of isocitrate dehydrogenase (IDH) gene mutations. Ki-67 is a marker for DAT proliferation, while programmed death ligand 1 (PD-L1) indicates an immune evasion mechanism. This study aimed to analyze the correlation among mutant IDH1 R132H, Ki-67, and PD-L1 immunoexpression in the DAT. Methods : A cross-sectional study was carried out on 30 paraffin blocks of DAT cases. Paraffin block samples consist of grade II (n=14), grade III (n=8), and grade IV (n=8). In this study, the immunohistochemistry-staining of mutant IDH1 R132H, Ki-67, and PD-L1 were carried out to determine the frequency of DAT with IDH1 mutations. Results : Our study shown the frequency of IDH1 mutations in grade II 50.0% (7/14), grade III 37.5% (3/8), and grade IV 12.5% (1/8). Our study also showed a difference in Ki-67 and PD-L1 expression between each the degree of DAT histopathology (p=0.0001 and p=0.002, respectively). There was an association between both mutant IDH1 R132H, and Ki-67 with PD-L1 expression in DAT (p=0.0087 and p=0.0049, respectively). Conclusion : DAT with the mutant IDH1 is frequently observed in grade II and small number of grade III. The expression of wild type IDH1, Ki-67, and PD-L1 were found to be higher in high grade DAT (grade III and grade IV). There is a correlation between each of mutant IDH1 status and Ki-67 with PD-L1 expression in DAT.
Tribology Characteristics in 300 μm of Hexagonal Array Dimple Pattern
H. J. Choi,A. S. Hermanto,S. H. Kwon,S. G. Kwon,J. M. Park,J. S. Kim,S. W. Chung,Y. H. Chae,W. S. Choi 한국트라이볼로지학회 2015 한국트라이볼로지학회지 (Tribol. Lubr.) Vol.31 No.6
In the tribological performance of materials, a textured surface reduces the friction coefficient and wear. This study investigates the effects of a pattern of 300 μm dimples in a hexagonal array on the tribological characteristics. Previous studies investigated 200 μm dimples by using a similar material and method. There are three frictional conditions based on the Stribeck curve: boundary friction, mixed friction, and fluid friction. In this experiment, we investigated the frictional characteristics by conducting frictional tests at sliding speeds ranging from 9.6 rpm to 143.3 rpm and a normal load ranging from 13.6 N to 92 N. We used a photolithography method to create dimples for surface texturing. We used five specimens with different dimple densities 10%, 15%, 20%, 25%, and 30% in this study. The dimple density on the surface area is one of the important factors affecting the friction characteristics. The duty number graph indicates a fully developed fluid friction regime. Fluid friction occurs at a velocity of 28.7-143.3 rpm. We observed the best performance at a dimple density of 10% and a dimple diameter of 300 μm in the hexagonal array, the lowest friction coefficient at 0.0037 with 9.6 rpm 9.6N load, and the maximum friction coefficient at 0.0267 with 143.3 rpm 92N load.
Annisa Mardatillah,Sam’un Jaja Raharja,Bambang Hermanto,Tety Herawaty 한국식품연구원 2019 Journal of Ethnic Foods Vol.6 No.-
The purpose of this research is to provide an in-depth analysis of the commodification, authenticity, and sustainability of culinary legacy as an instance of intangible cultural legacy, as well as how to subsequently compete with excellence and sustainability in the midst of a modern, global era of business without the loss of authenticity value. Herein is revealed the application of true local culture amid commercialization and modernization, differentiating between the authenticity and that which is out-of-sorts with local identity. The controversy of contextualization, the discussion of what is necessary, and the commodification of traditional food, namely the traditional foods of Riau Malay, to respond to the demand of a global market, are areas of interest in this study, as well as how the traditional foods of Riau Malay may compete with excellence and sustainability in a global market while retaining its authenticity values. The methodology used in this research is qualitative phenomenological; the interviews were carried out from the informants who were cultural figures of Riau Malay, social figures, and business actors in the traditional Riau Malay food industry with resulting evidence that confirms the necessity of heritage value of traditional Riau Malay foods, commodification in the area of globalization, without necessitating any loss of authenticity elements. The cultural heritage of traditional Riau Malay foods is introduced in two different types, cake pastry and main course savory dishes, and divided into two categories, everyday cuisine and cuisine for ceremonies or rituals. Riau Malay natives have customs and culture involved in the preparation and processing; presentation and consumption of the food may also be seen in the efforts in preparing such a traditional menu. The findings of this study are expected to contribute to the literature and research interest in food culture.
Wardani Agustin Krisna,Utami Cinthya Putri,Hermanto Mochamad Bagus,Sutrisno Aji,Nurtyastuti Fenty 한국미생물·생명공학회 2023 한국미생물·생명공학회지 Vol.51 No.2
Bioethanol has recently attracted much attention as a sustainable and environmentally friendly alternative energy source. This study aimed to develop a potential process for bioethanol production by fed-batch fermentation using instant dry yeast. To obtain the highest cell growth, we studied the influence of the initial sugar concentrations and pH of sugarcane molasses in batch fermentation. The batch system employed three levels of sugar concentrations, viz. 10%, 15%, 20% (w/v), and two levels of pH, 5.0 and 5.5. The highest cell growth was achieved at 20% (w/v) and pH 5.5 of molasses. The fed-batch system was then performed using the best batch fermentation conditions, with a molasses concentration of 13% (w/v) which resulted in high ethanol concentration and fermentation efficiency of 15.96% and 89%, respectively.